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2fbcdfd4b4
Previously, connection::handle_error always called f.get() inside a try/catch,
forcing every failed future to throw and immediately catch an exception just to
classify it. This change eliminates that extra throw/catch cycle by first checking
f.failed(), getting the stored std::exception_ptr via f.get_exception(), and
then dispatching on its type via utils::try_catch<T>(eptr).
The error-response logic is not changed - cassandra_exception, std::exception,
and unknown exceptions are caught and processed, and any exceptions thrown by
write_response while handling those exceptions continues to escape handle_error.
Refs: #24567
Fixes: #25273
(cherry picked from commit 30d424e0d3)